Tuesday, February 3, 2009
Weight = Mass x Gravitational acceleration (W=mg)
Weight.
Weight is measured in newtons [N].
example of instrument that measures weight: spring balance
Mass.
Mass is measured in kilograms [kg].
example of instrument that measures mass: beam balance
Gravitational acceleration
Gravitational acceleration is measured in meters per square second [m/s(squared)] or newtons per kilogram [N/kg].
*measuring gravitational acceleration (N/kg)
[N] = [kg]G
G = [N]/[kg]
= [N/kg]
= N/kg
example:
G = 20N/2kg
= 10 N/kg
gravity...
on earth = 10 N/kg - secondary school
= 9.81 N/kg - JC
= 9.817 N/kg - industry
on moon = 1.6 N/kg
weight...
on earth = 40(kg) x 10(N/kg)
= 400N
on moon = 40(kg) x 1.6(N/kg)
= 64N
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